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please help this novice.

durin the pink noise subwoofer test @20hz, I hear sound from my center channel. All speakers set to snall. What is going on?
 

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... durin the pink noise subwoofer test @20hz, ...
What do you mean by this?

Using the REW Generator, if I select Pink Noise, Sub Cal, there is not a choice of frequencies. The built-in sub range has the -3dB rolloffs at 30Hz and 80Hz, 12db/octave. Are you confusing the frequency with the default level, -20.0dbFS? If so, the sub frequency range will have content up to and above the crossover you selected, 100Hz, even if this is attenuated slightly from the level in the center of the range.

Bill
 

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Or have you connected to the center channel of a multichannel input (which would not perform bass management)?
 
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